Java_集合操作_合并两个map

package test;import java.util.LinkedHashMap;import java.util.Map;public class test {public static void main(String[] args) {Map<String, String> map = new LinkedHashMap<String, String>();Map<String, String> map2 = new LinkedHashMap<String, String>();map.put("1", "a");map.put("2", "b");map.put("3", "c");map.put("3", "3");map.put("4", "4");map.put("5", "5");map.putAll(map2);System.out.println(map);}}

输出：

{1=a, 2=b, 3=3, 4=4, 5=5}

后面的map会覆盖前一个map中key相同的元素